I have "scraps" and I have several "started, but didn't work out -- I'll do something else with it someday" stash, but I don't have the wonderful extra bolts of fabric I've seen some people do have.
I think some people really know their "stuff" and collect wonderful fabrics for future use.
I try to keep a neat sewing room, and my "projects" are all stuffed in totes and drawers, lol!